10 yrs ago I spent the $$$ to have a receiver set up fabricated at a local welding shop and welded to the chassis of my old 27' Trail Bay. Always towed with bike rack and 2 bikes attached wherever we went. Safe and secure. Never a problem. Just traded in the old Trail Bay for the Creekside in my signature and have an appointment at a local welding shop for another receiver welded to the chassis.
Do not attach bike racks to the TT bumper. It is just not strong enough. Call 2 or 3 welding shops and tell them what you're looking for. You might be surprised.